A 320–360 GHz Subharmonically Pumped Image Rejection Mixer Using Planar Schottky Diodes

This letter presents the design, fabrication and test of an integrated 320-360 GHz subharmonic image rejection mixer using planar Schottky diodes. The integrated circuit uses two separate anti-parallel pairs of diodes mounted onto a single quartz-based circuit. Measurement results give best single sideband (SSB) receiver noise temperatures of approximately 3400 K at 340 GHz, with an image rejection from 7.2 to 24.1 dB over the 320-360 GHz frequency band. This work represents the first demonstration of a Schottky based SSB mixer at submillimeter wavelengths.